JavaScript显示表单内元素的数量,不包含表单本身
<!DOCTYPE html> <html> <body> <form id="frm1" action="form_action.asp"> First name: <input type="text" name="fname" value="Donald"><br> Last name: <input type="text" name="lname" value="Duck"><br> <input type="submit" value="Submit"> </form> <p>The number of elements in "frm1" are: <script> document.write(document.getElementById("frm1").length); </script> </p> </body> </html>
上面的代码返回结果如下:The number of elements in ”frm1″ are: 3